Hi
There can be various causes for reddish spots on the ankles and feet. The common ones are scabies, eczema, lichen planus,
psoriasis, fungal
infection (tinea pedis), erythema multiforme, dyshidrotic dermatitis, etc.
Lichen planus lesions are discrete, individual lesions of 1 to 2 mm in diameter or larger, coalesced lesions of 4 to 5 mm in diameter. Typically, the lesions are polygonal, purple, itchy papules.