Pimples or acne on the face have a tendency to leave behind marks - this is known as post inflammatory hyperpigmentation. This especially happens if the acne is touched or broken. Applying the garlic paste added an irritant component to it also causing contact irritant dermatitis which in turn also heals with post inflammatory hyperpigmentation.
This mark will require certain creams with arbutin, glycolic acid or mandelic acid to remove it. It is better to consult a dermatologist to make sure the irritant component has completely reversed before starting anything new in order to avoid further irritation of the skin.
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