Suggest Treatment For Spongiosis And Elongation Of Rete Pegs

my son biopsy report states "the epidermis shows spongiosis & elongation of rete pegs. the basal cell layer show dissoloution &its interface with the dermis is edematous with dilated capill. & mononuclear infilitrate.Pigment incontinence a& several melanophages are seen . Mild pervascular edema and mononucler infilitrate is seen in the deeper dermis. There is no evidence of maligancy

remark 1)partly treated lichen planus pigmentosus

2)chornic non specific dematitis.please could u explain why these marks r not decreaseing 2) what is he suffering from .

my son is 22 years oldand studing product designing at pune college .he got this when he was studing in 1st year of college ( now he is in 4th year. he normal active boy. no vices/girlfriend from munira kachwalla