My skin is usually pretty good, but over the past few months I've been breaking out with these awful spots that are like under the skin pimples, but also have a white head(picture below). They only form on my chin and right under my nose. They are GIANT and I have no clue how to treat them. I've tried salicylic acid and benzoyl peroxide, but nothing is helping. I could really use some advice on how to treat them and stop new ones from forming.