You are using tretinoin and clindamycin
,,this is a combination which is very effective in acne and is very frequently prescribed by dermatologists...But the problem is that proper application of this topical medication
is very important..
It has to be applied only at night
Very little amount has to be applied,,and it should not be rubbed onto the skin,,,The cream should only be touched over the affected area.
Now in your case, you have developed irritant dermatitis
Firstly, you should stop using it for the time being.. Use a mild topical steroid
over the affected areas twice a day for 4-5 days or till the time the redness and irritation subsides.And use an oil free moisturiser regularly over your face to decrease the dryness of skin,,,Also use a sunscreen (spf>26) regularly over your face before going out in the sun..
Once the irritation stops, then you can use simple clindamycin gel over your face over the acne lesions twice a day..
Hope it helps
Dr Geetika Paul