Greetings! Thanks for the query. The description of the symptoms and photos suggest that the problem is likely to be psoriasis (Palmo plantar type). Please consult a Dermatologist for proper assessment and customised treatment plan. I can assure you that with proper treatment your father's symptoms will improve. In the mean time you can apply ointment/ creams containing "coal tar" and "salicylic acid" to the affected areas.