tinea versicolor is a common, superficial fungal (yeast) skin condition that alters normal skin color. It typically causes lighter, darker, or mildly pink patches with fine scale, most often on the trunk, neck, and upper arms. In cosmetic and plastic surgery settings, it matters because it can mimic or complicate pigment changes seen before or after aesthetic procedures. It is primarily a dermatologic diagnosis but is relevant to both cosmetic and reconstructive care when skin tone uniformity is a goal.

albinism is an inherited condition that reduces the body’s ability to make melanin, the pigment that colors skin, hair, and eyes. It is commonly discussed in dermatology and ophthalmology and is also relevant in cosmetic and reconstructive care. albinism can affect appearance (skin and hair color) and function (especially vision and light sensitivity). Clinical planning may differ because pigment-related biology influences sun response, visible redness, and some procedure choices.

hypomelanosis means an area of skin (or hair) has less melanin pigment than expected. It is a descriptive clinical term, not a single disease. It can be congenital (present from birth) or acquired later in life. It is discussed in both cosmetic and reconstructive settings because pigment differences can affect visual uniformity and scar appearance.

hypermelanosis is a clinical term for increased skin pigmentation caused by excess melanin. It may appear as patches, spots, or more diffuse darkening of the skin or mucosa. The term is used in both medical dermatology and cosmetic medicine to describe pigment changes that affect appearance. It can also be relevant in reconstructive contexts, such as pigment changes after injury, inflammation, or procedures.

A café-au-lait macule is a flat, light-to-dark brown patch on the skin caused by increased pigment. It is usually harmless and often noticed in childhood, but it can appear at any age. Clinicians use the term in both general dermatology and in cosmetic consultations when appearance is a concern. It can also be relevant in reconstructive and medical evaluations because multiple spots may be a clinical clue in certain syndromes.

ephelides are small, flat, light-to-medium brown spots commonly called freckles. They usually appear on sun-exposed skin such as the face, shoulders, and arms. They often become darker with ultraviolet (UV) exposure and lighter when sun exposure decreases. The term is used in clinical dermatology and cosmetic consultations to describe a benign pigmentation pattern.

freckles are small, flat spots of increased skin pigment that commonly appear on sun-exposed areas such as the face, shoulders, and arms. They are usually tan to light-brown and can become more noticeable with ultraviolet (UV) exposure. In clinical practice, freckles are discussed in both cosmetic dermatology (appearance-focused care) and general skin assessment (to distinguish them from other pigmented lesions). Some people also seek freckles intentionally as an aesthetic look using makeup or cosmetic tattooing.

solar lentigines are benign (non-cancerous) flat brown-to-tan spots that develop on sun-exposed skin over time. They represent increased pigment (melanin) in the skin and are commonly called “age spots” or “sun spots.” They are most often discussed in cosmetic dermatology and aesthetic medicine because they affect visible areas like the face and hands. They can also be relevant clinically because they may resemble other pigmented lesions that require medical evaluation.

lentigo is a well-defined, flat, tan-to-brown pigmented spot on the skin. It reflects increased melanin (skin pigment) in a localized area and is often related to sun exposure or normal pigment biology. The term is used in dermatology and cosmetic medicine to describe certain “sun spots” and other benign lesions. It is also used in reconstructive and oncologic contexts when discussing precancerous or cancer-adjacent entities (for example, lentigo maligna).

melasma is an acquired form of hyperpigmentation that appears as patchy brown, tan, or gray-brown discoloration on the skin. melasma most often affects sun-exposed areas of the face, and it can also appear on other exposed sites. melasma is a benign (non-cancerous) condition, but it can be cosmetically distressing due to its visibility and tendency to recur. melasma is commonly discussed in cosmetic dermatology and aesthetic medicine rather than reconstructive surgery.

vitiligo is a skin condition where patches of skin lose pigment and appear lighter than surrounding areas. It happens when melanocytes (pigment-producing cells) are reduced or stop functioning in affected skin. It is discussed in both medical dermatology and cosmetic/reconstructive settings because it can change visible skin tone and facial or body symmetry. It can involve skin anywhere on the body and may also affect hair pigment in the involved areas.

pustular psoriasis is an inflammatory skin disease in the psoriasis spectrum that causes visible pus-filled bumps (pustules) that are not due to infection. It can appear suddenly and may involve localized areas (often hands/feet) or large body surfaces. The term is most commonly used in medical dermatology, but it also matters in cosmetic and reconstructive settings because it affects skin quality and healing. It is discussed clinically when planning procedures that interact with the skin barrier, such as resurfacing, incisions, grafts, or wound care.

inverse psoriasis is a form of psoriasis that affects skin folds where skin touches skin. It typically appears in areas like the armpits, groin, under the breasts, and between the buttocks. It is used as a clinical diagnosis in both general dermatology and preoperative planning for cosmetic and reconstructive procedures involving skin folds. It often looks different from “classic” scaly plaque psoriasis because moisture and friction change its appearance.

guttate psoriasis is a form of psoriasis that causes many small, drop-like red or pink scaly spots on the skin. It is an immune-mediated inflammatory skin condition, often appearing suddenly, sometimes after an infection. It is most commonly discussed in medical dermatology, but it also matters in cosmetic and reconstructive care because active inflammation can affect procedural planning and skin healing. It is diagnosed clinically and may be supported by tests or a skin biopsy when the appearance is unclear.

plaque psoriasis is a chronic inflammatory skin condition that causes well-defined, raised, scaly patches called plaques. It is driven by immune-mediated inflammation and faster-than-normal skin cell turnover. It is most commonly discussed in dermatology, but it is also relevant in cosmetic and reconstructive settings because it affects visible skin and can influence procedure planning. It can flare and quiet over time, and severity varies by person and context.

psoriasis is a chronic, immune-mediated inflammatory condition that most commonly affects the skin and sometimes the nails and joints. It typically appears as well-demarcated, red plaques with scale, with flares and periods of relative quiet. Clinicians use the term in dermatology, primary care, and rheumatology, and it is also relevant in cosmetic and reconstructive planning. In aesthetic and plastic surgery settings, psoriasis matters because skin inflammation can influence procedure selection, timing, and wound healing considerations.

dyshidrotic eczema is an inflammatory skin condition that causes small, itchy blisters on the hands and/or feet. It most often affects the sides of the fingers, palms, and soles. It is used as a clinical diagnosis in general dermatology and can also be relevant in cosmetic and reconstructive care when hand or foot skin health affects procedures and healing. It tends to occur in flares, with symptoms that may come and go.

nummular eczema is an inflammatory skin condition that forms round or “coin-shaped” patches of irritated skin. It is commonly itchy and can look red, scaly, weepy, or crusted depending on the stage. Clinicians also call it *nummular dermatitis*, and it is used in both medical dermatology and pre-procedure skin assessment in cosmetic and reconstructive settings.

irritant contact dermatitis is a skin inflammation caused by direct damage from an irritating substance or repeated exposure. It is not an allergy, and it does not require prior “sensitization” to develop. It commonly appears where cosmetics, skincare, adhesives, disinfectants, or friction contact the skin. It matters in both cosmetic and reconstructive settings because it can affect skin comfort, healing, and how products are tolerated.

Allergic contact dermatitis is an immune-mediated skin reaction that happens after the skin touches a substance an individual is sensitized to. It is a *delayed* allergy (often appearing hours to days after exposure), not an immediate “hives” reaction. It commonly affects areas exposed to cosmetics, topical products, metals, adhesives, gloves, and medical dressings. In cosmetic and reconstructive care, it matters because it can mimic infection or irritation around procedures, wound sites, and devices.