- Salivary Gland Mucocele (Mucoocele)
- Sarcoidosis (cutaneous sarcoidosis)
- Scabies
- Scarlet Fever (Scarlatina)
- Schnitzler's Syndrome
- Schwannoma (neurilemmoma, Schwann cell tumor)
- Scleredema (Scleredema of Buschke, Scleredema Adultorum, Scleredema Diabeticorum)
- Sclerema Neonatorum (Sclerema adiposum)
- Scleromyxedema (generalized and sclerodermoid lichen myxedematosus, papular mucinosis, Arndt-Gottron scleromyxedema)
- Scurvy (Vitamin C deficiency, Ascorbic acid deficiency)
- Seabather’s eruption
- Sebaceoma (Sebaceous epithelioma)
- Sebaceous Adenoma
- Sebaceous Carcinoma (Sebaceous Gland Carcinoma, Sebaceous Cell Carcinoma, Meibomian Gland Carcinoma)
- Sebaceous Gland Hyperplasia (Sebaceous Hyperplasia, Senile Sebaceous Hyperplasia)
- Seborrheic Dermatitis (Seborrheic Dermatitis, Seborrheic Eczema, Dermatitis Seborrhoides, Seborrheic dermatitis unspecified, Seborrheic Capitis, Pityriasis Capitis, Scalp Dandruff, Pityriasis Sicca, Infantile seborrheic dermatitis, Seborrheic Blepharitis)
- Seborrheic Keratosis (verruca senilis, senile wart, verruca seborrhoica, seborrheic wart, basal cell acanthoma, basal cell papilloma, benign acanthokeratoma)
- Serum Sickness
- Sjögren’s Syndrome
- Smallpox (variola, variola major, variola minor, variola vera, alastrim, the pox, variole, viruela, pocken, blattern
- Smooth Muscle Hamartoma (Congenital Smooth Muscle Hamartoma, Acquired Smooth Muscle Hamartoma)
- Sneddon’s Syndrome
- Sneddon-Wilkinson Disease (Subcorneal pustular dermatosis)
- Spider Bites (Venomous spider bites)
- Spindle Cell Hemangioma (Spindle Cell Hemangioendotheilioma [older terminology])
- Spindle Cell Lipoma
- Spitz nevus
- Sporotrichosis (Rose gardener’s disease)
- Squamous Cell Carcinoma of the Skin
- Staphylococcal Infections
- Staphylococcal Scalded Skin Syndrome (Ritter’s disease)
- Stiff Skin Syndrome (Mucopolysaccharidosis)
- Striae distensae (striae atrophicae)
- Stucco keratosis (keratosis alba)
- Sturge-Weber syndrome
- Subacute Cutaneous Lupus Erythematosus (SCLE)
- Subcutaneous fat necrosis of the newborn
- Subcutaneous panniculitic T cell lymphoma (subcutaneous ’panniculitis-like’ T-cell lymphoma, previously termed cytophagic histiocytic panniculitis)
- Subungual exostosis (Dupuytren's subungual exostosis, enchondroma)
- Sunburn (solar erythema)
- Superficial acral fibromyxoma
- Supernumerary digits (polydactyly, extra fingers)
- Supernumerary nipple (polythelia, accessory nipple, third nipple)
- Swimmer’s ear (otitis externa, infection of the external ear canal)
- Swimmer’s itch (cercarial dermatitis)
- Syphilis (primary syphilis, latent syphilis, cardiovascular syphilis, secondary syphilis, tertiary syphilis, neurosyphilis)
- Syringoma (benign neoplasm of skin)
- Systemic Amyloidosis with Cutaneous Manifestations (Amyloidosis, Primary Systemic Amyloidosis, AL Amyloidosis)
- Systemic Contact Dermatitis (Contact Dermatitis, Systemic; Baboon syndrome; Fisher's systemic contact dermatitis; Systemic contact-type dermatitis; Hematogenous contact eczema; Symmetrical Drug-Related Intertriginous and Flexural Exanthem [SDRIFE] Systemic reactivation of allergic contact dermatitis [RCD])
- Systemic Lupus Erythematosus (SLE)
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