Test your diagnostic skills

 • Tophaceous gout  • Heberden’s nodes • Mallet finger • Dupuytren’s contracture • Hand dermatitis • Scleroderma/Raynaud’s disease

• Cellulitis • Gastrocnemius atrophy • Infected arthritis of the knee • Lymphoedema • Necrobiosis lipoidica • Allergic contact dermatitis

• Juvenile plantar dermatosis
• Molluscum contagiosum
• Verrucas
• Impetigo
• Breast buds
• Slapped cheek disease

• Acanthosis nigricans • Morphoeic basal cell carcinoma • Primary cutaneous anaplastic large cell lymphoma • Amelanotic melanoma • Dermatofibrosarcoma protuberans • Squamous cell carcinoma [With external links to current evidence and summaries]

• Haematoma
• Furuncle
• Prayer nodule
• Pilomatrixoma
• Umbilical granuloma
• Neurofibroma

• Malignant melanoma
• Pigmented basal cell carcinoma
• Seborrhoeic keratosis
• Lichen planus
• Dermatofibroma

• Acute paronychia
• Intertrigo
• Tinea pedis
• Bullous impetigo
• Folliculitis
• Necrotising fasciitis

• Pompholyx
• Primary herpes simplex
• Epidermolysis bullosa simplex
• Varicella zoster
• Cellulitis
• Herpes labialis

• Impetigo
• Molluscum contagiosum
• Pterygium
• Subconjunctival haemorrhage
• Corneal rust spot
• Basal cell carcinoma

In this month's photoguide:

• Hallux valgus
• Chronic venous insufficiency
• Onychogryphosis
• Pressure sores
• Shingles

Test your diagnostic skills.

• Acrodermatitis continua of Hallopeau
• Umbilical fistula
• Inguinoscrotal appendicitis
• Upper lid entropion
• Clear cell acanthoma
• Darier’s disease

• Pityriasis rosea
• Herald patch
• Pityriasis versicolor
• Pityriasis alba
• Pityriasis capitis
• Pityriasis amiantacea

• Alopecia mucinosa
• Pseudopelade
• Female pattern baldness
• Androgenic baldness
• Trichotillomania

• Keloid scar
• The Koebner phenomenon
• Burns
• Healing by secondary intention
• Morphoeic basal cell carcinoma
• Striae

• Skin metastases
• Pyoderma gangrenosum
• Xanthelasma
• Graft versus host disease
• Erythema nodosum
• Necrobiosis lipoidica

• Palmar erythema
• Varicose veins
• Vasculitis
• Erythema ab igne
• Spider naevi
• Angiokeratoma of Fordyce

• Seborrhoeic dermatitis 
• Lichen planus 
• Lamellar dyshidrosis 
• Psoriasis 
• Parapsoriasis en plaque 
• Mycosis fungoides

 • Actinic keratoses • Asteatotic eczema  • Bowen’s disease  • Seborrhoeic keratoses  • Basal cell carcinoma  • Varicose eczema

• Discoid lupus erythematosus
• Dermatomyositis
• Scleroderma
• Morphoea
• Lichen sclerosus
• Panniculitis

• Hidradenitis suppurativa
• Steatocystoma multiplex
• Acne vulgaris
• Rosacea
• Conglobate acne
• Local hyperhidrosis