1 month back my doctor diagonesd that iam suffering from P.Rosea..because i had red patches on my back..i gave me medicines n ointment to apply..now the rednes of that patch has gone but it has become patchy..my skin has become light coloured in that area ,little patchy , nd the patch is increasing.My doctor said it is because i have excessive dry skin..but iam confused what exactly is happening with me?