On diascopy, it shows characteristic "apple-jelly" color. Biopsy will reveal tuberculoid granuloma with few bacilli. Mantoux test is positive. Differential diagnosis The condition should be distinguished from: * Basal cell carcinoma * Sarcoidosis * Discoid<unk>  erythomatosus * Leprosy * Deep fungal infection
Lupus vulgaris
Parapsoriasis
Vitiligo
Sycosis vulgaris
Steroid rosacea
Alopecia mucinosa
Eczema vaccinatum
Psoriasis