Small pimples and pimple marks on my back for years

Dear Patient: Every medicine has side effects and adverse effects. It differs from person to person. It was not clear what medicines your uncle has been using? The Persol AC 2.5 gel has some possible side effects like painful irritation of the skin, including blistering, burning, severe redness, swelling and skin rash in some rare cases. Please consult your physician immediately, he may suggest you some antidote.