The first thing I should say is for the most accurate diagnosis you need to see a dermatologist as there are a number of different conditions that can cause this and all of them require treatment by a dermatologist.
Any skin condition, when it is scratched or rubbed, can develop the changes that you describe.
Here are some possibilities:
1. Lichen planus - a very itchy skin disease that presents as purplish flat-topped papules that when scratched, thicken and have a crust. Lichen planus can occasionally be associated with certain internal diseases or medications.
2. Psoriasis - starts out as red or dark, thickened skin with a silvery crust. Psoriasis is often present on elbows and knees first and then spreads.
3. Eczema - an itchy, scaling skin condition that is associated with allergies, asthma, hayfever and dry skin.
4. Two conditions that arise simply from rubbing or scratching the skin:
- Lichen simplex chronicus and prurigo nodularis. In patients with prurigo nodularis, we look for internal causes of itching.
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