Contact dermatitis scalp , flaky.

I have had a permanent straightening 1.5 months back and have Flaky scalp from few days .. few years back I had mild seborriac dermatitis and was given topisol 6 % and salisia kt and it had worked well with 2 applications everything cleared and later whenever I had the flakes I used it and managed with no problem.. that is what the doctor had told use when required.. few months I had no problems at all and went for L’oreal straightening .. my question is after straightening can I use them the same way.. it's more than 6 weeks since I straightened my hair..I have attached the pic of the flakes .. it's here and there .. not much .. I have used lemon it subsides after 3 days it shows up.. pls let me know show I go for medicines or stick to home remedies.. if I have head bath 3 times a week I don't think I will see flakes .. but I prefer washing hair twice a week.. thanks in advance..