In reply to your question regarding your hands and feet and your increase sweating. You appear to have the condition Raynauds or a form of given the mechanism is not typically the same as the more common form of Raynuads which you describe.
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It doesnt come back thinner but it does appear tho be thinner as the end is tapiered creating a smoother finer hair. as some have said it can cause spots when make up is applied and yes in growing hairs can happen. Using tea tree lotion afterwards can help as its a anti bacterial and soothing.