sunscreen allergy is an immune-mediated skin reaction to one or more ingredients in a sunscreen product. It most often presents as an itchy, red, eczematous rash where the product was applied. Some reactions occur only after sunlight exposure and are called photoallergic reactions. It is relevant in both cosmetic and reconstructive care because sun protection is commonly recommended before and after procedures.

UV exposure is contact with ultraviolet radiation from the sun or artificial sources such as tanning beds and phototherapy devices. It is commonly discussed in cosmetic and reconstructive care because it changes skin tone, texture, and healing behavior. It can be intentional (for tanning or medically supervised phototherapy) or unintentional (daily outdoor exposure). Clinicians often assess UV exposure when planning procedures that affect pigment, scars, or skin resurfacing.

chronic sun damage is the cumulative injury to skin from long-term exposure to ultraviolet (UV) radiation, mainly from sunlight and tanning devices. It is commonly discussed in cosmetic medicine because it changes skin color, texture, and elasticity over time. It is also clinically important in reconstructive and medical settings because it can contribute to precancerous lesions and skin cancers. The term is used to describe both visible “photoaging” and microscopic changes that affect how skin heals and responds to procedures.

solar elastosis is a skin change caused by long-term ultraviolet (UV) exposure, most often from sunlight. It describes degeneration of normal dermal support tissue with accumulation of abnormal elastic material. It is commonly discussed in dermatology and dermatopathology, and it is highly relevant to cosmetic facial aging assessments. It can influence cosmetic and reconstructive planning because sun-damaged skin may behave differently during healing and resurfacing.

photoaging is premature skin aging caused mainly by chronic exposure to ultraviolet (UV) radiation, most often from sunlight. It commonly shows up as uneven pigment, fine lines, deeper wrinkles, texture roughness, and visible blood vessels. The term is used widely in cosmetic dermatology and plastic surgery because it affects appearance and skin quality. It can also be clinically relevant in reconstructive settings when sun-damaged skin influences healing and planning.

sunburn is an acute inflammatory injury to the skin caused by ultraviolet (UV) radiation exposure. It most often follows sun exposure but can also occur after artificial UV sources such as tanning devices. In cosmetic and reconstructive care, sunburn is discussed because it affects skin healing, pigment, and timing of procedures. Clinicians also evaluate sunburn to distinguish it from other rashes, burns, and photosensitivity reactions.

actinic cheilitis is a sun-related, chronic inflammatory and precancerous change of the lip, most often the lower lip. It develops after repeated ultraviolet (UV) exposure that damages the lip’s surface (vermilion) over time. Clinically, it is a diagnosis used in dermatology, oral medicine, and head-and-neck care to describe a “sun-damaged lip” with potential for dysplasia. It is relevant to both reconstructive and cosmetic practice because evaluation and treatment can affect lip contour, texture, and the vermilion border.

cheilitis is inflammation of the lips, most often affecting the vermilion (the pink lip) and the lip corners. It is a clinical term used across dermatology, dentistry, and primary care to describe several lip conditions with different causes. In cosmetic and plastic surgery contexts, cheilitis matters because active lip inflammation can change appearance, comfort, and healing around lip procedures. It can be acute (short-lived) or chronic (persistent or recurring), depending on the trigger and underlying diagnosis.

angular cheilitis is inflammation and breakdown of the skin at the corners of the mouth (the oral commissures). It commonly appears as redness, cracking, scaling, or painful fissures at one or both mouth corners. It is a clinical diagnosis used in general dermatology, dentistry, and primary care, and it also matters in cosmetic and reconstructive facial care. In aesthetic practice, it may be discussed when perioral volume, denture fit, saliva pooling, or post-procedure irritation affects the mouth corners.

periorbital dermatitis is inflammation of the skin around the eyes, including the upper and lower eyelids. It commonly presents with redness, scaling, dryness, swelling, itching, or burning in the periorbital (eye-adjacent) area. It is a clinical umbrella term used in medical dermatology and ophthalmology to describe several possible dermatitis patterns affecting eyelid skin. It is relevant in both cosmetic and reconstructive contexts because the eyelid region is highly visible and frequently exposed to products and procedures.

perioral dermatitis is an inflammatory facial rash that most often appears around the mouth. It typically presents as small red bumps (papules) and sometimes pustules on irritated skin. It is discussed in both medical dermatology and aesthetic (cosmetic) practice because it affects facial appearance and may flare with certain skincare or procedures. Despite the name, it can extend beyond the mouth to the nose or eyes in some cases.

striae albae are mature stretch marks that appear pale, white, or silvery. They represent later-stage skin changes after earlier red or purple stretch marks fade. They are commonly discussed in cosmetic dermatology and plastic surgery consultations. They may also be noted in reconstructive planning when skin quality affects incision placement or healing expectations.

striae rubrae are early-stage stretch marks that appear pink, red, or violaceous. They reflect recent skin stretching with visible superficial blood vessels and mild inflammation. The term is used in dermatology and cosmetic medicine to describe a time-sensitive phase of striae. It is most commonly discussed in cosmetic contexts, but it can also appear in medical and reconstructive settings.

stretch marks are linear skin changes (also called *striae distensae*) that develop when the dermis is stretched faster than it can adapt. They often start as pink, red, or purple lines and may fade over time to lighter, thinner streaks. They are common on the abdomen, breasts, hips, buttocks, thighs, and upper arms. They are primarily addressed in cosmetic care, but they can also be relevant in reconstructive contexts (for example, when planning body-contouring surgery).

A hyperpigmented scar is a scar that appears darker than the surrounding skin due to increased visible pigment. It is commonly discussed in cosmetic dermatology and plastic surgery because it affects how noticeable a scar looks. It can occur after surgery, trauma, burns, acne, or inflammatory skin conditions. It may be seen in both cosmetic and reconstructive settings, especially when scar blending and symmetry are goals.

A hypopigmented scar is a scar that appears lighter than the surrounding skin. It reflects reduced visible pigment (melanin) in the healed area. It can follow surgery, injury, burns, acne, or inflammatory skin conditions. The term is used in both cosmetic and reconstructive settings to describe scar color mismatch.

An atrophic scar is a depressed scar that sits below the surrounding skin surface. It forms when the skin does not rebuild enough collagen during healing. It is commonly discussed in cosmetic dermatology and plastic surgery because it affects skin texture and light reflection. It can also be relevant in reconstructive care when scarring changes contour or function.

rolling scars are a type of atrophic (depressed) scar that creates a soft, wavy, “rolling” texture on the skin. They are commonly associated with past acne and appear most often on the cheeks, jawline, and temples. They form when fibrous bands tether the skin down to deeper tissue, creating shallow, broad depressions. The term is used in cosmetic dermatology and plastic surgery to describe scar shape and guide treatment planning.

boxcar scars are a type of atrophic (depressed) scar with relatively sharp edges and a flat-looking base. They are commonly associated with inflammatory acne but can also follow other skin injuries. The term is used in cosmetic and dermatologic evaluation to describe scar shape and depth. They matter in both cosmetic care (appearance) and reconstructive planning (texture and contour).

ice pick scars are narrow, deep, pitted scars most commonly left behind after inflammatory acne. They often look like tiny “puncture” marks with a small surface opening and depth extending into the dermis. The term is used in cosmetic dermatology and plastic surgery to classify acne scarring patterns and plan treatment. They are primarily an aesthetic concern, but they can also affect texture, makeup wear, and perceived skin quality.