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Cold sores are blister-like tiny lesions that can appear on the chin, lips, cheeks, nostrils, or at times, inside the mouth.

They cause distressing symptoms such as burning sensation, pain, and itching, and can eventually burst and start to crust.

Any type of skin, be it normal, dry, or oily, can have open pores that are large in size. The appearance of these pores can cause your skin to look dull, especially if they are blocked with bacteria, oil, dirt, and dead skin cells.