5 red spots on my arm one is big starting a little bit to blister., another spot is smaller that is completely blistered/bubbled up., none itchy.?

Unexplained rashes. should be examined. Give a call to your gp.
Rash. Is sounds like you may be developing a skin infection. Keep the area clean and apply polysporin (bacitracin and polymyxin) and see your doctor. You may need antibiotics. All the best.

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