Neem can help you in solving this problem of yours.
(i) Daily shower with Neem Soap, (ii) application of Neem Oil on the skin especially the part that is effected (this might be better applied at night because of its unusual odor) and (iii) internal consumption of Neem leaf powder shall help you to see the results in a couple of weeks.
Since I am not a registered practitioner, you have to take advise/consult your physician and then proceed with the above.
Please take care regarding the quality of the Neem Oil / Neem powder you buy.
Take patch test with Neem Oil first. If its too strong, then you can dilute it in any veg. oil and then apply.
Neem Leaf powder should be taken @ 1gm daily after meals. If you get any constipation problems then decrease the dosage or take herbal laxatives with the same.
