That is one reason why you should go slow when you gain and lose weight. Look into what pregnant, and recently pregnant women do to prevent stretch marks and try and remove them afterwards. Maybe there are some laser surgery options or skin dermibrasion thing you can look into.
As for the loose skin, you can gain muscle or get a tummy tuck if it is really bad. If you went from 190->155, I couldn't imagine there being that much extra skin. It might just take a little time to come back and tighten up a little.
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