| Reaction | |
|---|
| Abrasion (2) | |
| Abscess (46) | |
| Acantholysis (1) | |
| Acanthosis nigricans (19) | |
| Acne (unspecified) (4) | |
| Acne fulminans (acne maligna) (2) | |
| Acne inversa | |
| Acne keloid (5) | |
| Acne vulgaris ("acne") (3) | |
| Acneiform eruption / acneiform dermatitis / acneiform rash (235) | |
| Acneiform papular (1) | |
| Acneiform pustular (1) | |
| Acral desquamation (1) | |
| Acral erythema (23) | |
| Acral necrosis (4) | |
| Acral purpura (2) | |
| Acral sclerosis (2) | |
| Acrodermatitis enteropathica (1) | |
| Actinic granuloma (1) | |
| Actinic keratoses (20) | |
| Acute febrile neutrophilic dermatosis (Sweet's / Sweet syndrome) (90) | |
| Acute generalized exanthematous pustulosis (AGEP) (169) | |
| Adermatoglyphia (fingerprint loss) (1) | |
| Allergic granulomatous angiitis / Eosinophilic Granulomatosis with Polyangiitis (EGPA) / Churg-Strauss syndrome (see also anti-neutrophil cytoplasmic antibody (ANCA) vasculitis (angiitis) (44) | |
| Allergic skin reactions (see also 'allergic reactions') (1) | |
| Anaphylactoid reactions / anaphylaxis (includes anaphylactic shock) (451) | |
| Anetoderma (2) | |
| Angioedema (398) | |
| Angiofibromatosis (1) | |
| Angiokeratoma (1) | |
| Angioma (2) | |
| Anhidrosis (2) | |
| Anti-neutrophil cytoplasmic antibody (ANCA) vasculitis (angiitis) (see also allergic granulomatous angiitis / Eosinophilic Granulomatosis with Polyangiitis (EGPA) / Churg-Strauss syndrome (5) | |
| Anticonvulsant hypersensitivity syndrome (see DRESS syndrome) | |
| Aplasia cutis congenita (2) | |
| Atopic dermatitis (14) | |
| Atrophie blanche (1) | |
| Atrophy / Skin atrophy (20) | |
