47 articles
Paget's disease of the breast
Paget's disease of the breast, also called Paget disease of the nipple, is a rare cancer of the nipple and areola, often with itching, redness, and crusting, that usually signals underlying breast cancer.
Panniculitis
Panniculitis, inflammation of subcutaneous fat, also called Weber-Christian disease historically; classified as septal or lobular with or without vasculitis; erythema nodosum is the most common form.
Perioral dermatitis
Perioral dermatitis, also called periorificial dermatitis (POD), is a chronic acneiform rash around the mouth, nose, or eyes, mainly in women 20–45, strongly linked to topical corticosteroids and treated with zero therapy and tetracyclines.
Pityriasis alba
Pityriasis alba, also called white eczema, is a common childhood skin disorder causing round, mildly scaly hypopigmented facial patches, linked to atopic dermatitis, not contagious, and usually resolving within about a year.
Post traumatic eczema
Post traumatic eczema (post-traumatic dermatitis), ICD-11 EA88.1, is eczema localized to skin damaged by physical trauma or chemical or thermal burns, often recurring for years and distinguished from autonomic denervation dermatitis.
Pruritic urticarial papules and plaques of pregnancy
Pruritic urticarial papules and plaques of pregnancy (PUPPP, polymorphic eruption of pregnancy) is the most common dermatosis of pregnancy: an intensely itchy hive-like rash starting in third-trimester stretch marks, sparing the umbilicus, resolving after delivery with no fetal risk.
Psoriasiform napkin dermatitis
Psoriasiform napkin dermatitis (PND), ICD-11 EH40.02, is a sharply marginated scaly diaper-area eruption of infancy resembling psoriasis; HLA studies and follow-up data distinguish it from true psoriasis, though some cases eventuate into napkin psoriasis.
Rhinophyma
Rhinophyma (drinkers' nose, phymatous rosacea) is the bulbous nasal enlargement of end-stage rosacea, affecting mostly men over 50; surgery is definitive, medical therapy is not, and alcohol causation is contested.
Rosacea
Rosacea: chronic inflammatory skin condition of the central face causing flushing, persistent redness, acne-like bumps, visible vessels, and eye symptoms; affects adults 30–60, no cure, treated with topicals, doxycycline, lasers.
Scabies
Scabies (Sarcoptes scabiei var. hominis infestation), also called the itch or Norwegian scabies in crusted form, is a contagious mite infestation causing intense nocturnal itching, affecting about 200 million people worldwide, treated with permethrin or ivermectin.
Seborrhoeic dermatitis of the scalp
Seborrhoeic dermatitis of the scalp (ICD-11 EA81.1; dandruff is its mild form) is a chronic relapsing inflammatory scalp disease linked to Malassezia yeasts, sebum, and immune dysregulation, treated with antifungal and anti-inflammatory shampoos.
Secondary eczema
Secondary eczema (id reaction, autoeczematisation, autosensitisation dermatitis; ICD-11 EA88.2/EA88.3) is eczematous dermatitis arising secondary to another skin disease, typically a widespread itchy eruption following a neglected lower-leg rash, infection, or contact dermatitis.
Secondary lichenification
Secondary lichenification (ICD-11 EA83.1): thickened, leathery skin with increased markings caused by repeated rubbing and scratching of skin already affected by a primary pruritic dermatosis such as atopic eczema, psoriasis, or lichen sclerosus.
Skin condition
Skin condition: any disorder altering skin appearance or function; the eczema/dermatitis family, especially atopic dermatitis, a chronic itchy inflammatory condition with barrier disruption, immune dysregulation, and topical treatments.
Spontaneous human combustion
Spontaneous human combustion (SHC) is the alleged burning of a living human body without external ignition. Reported since the 17th century, it is explained forensically by the fat wick effect and was popularized by Dickens's Bleak House.
Stevens–Johnson syndrome
Stevens–Johnson syndrome (SJS), with toxic epidermal necrolysis (Lyell syndrome) at the severe end, is a rare drug-triggered blistering skin-mucosa reaction; mortality about 10% in SJS, up to 50% in TEN; SCORTEN predicts death.
Swimmer's itch
Swimmer's itch, or cercarial dermatitis, is an itchy allergic rash from bird and mammal schistosome cercariae penetrating swimmer's skin in fresh or salt water; larvae die in humans, rash resolves in 1–2 weeks, worldwide in summer.