Hi, I was in a tanning bed for the first time in years and was overexposed. After about 3 days I broke out in 6 large raised bumps, which now look like blisters. (on my sacrum ) They do not hurt but itch . I have applied steroid creams, which help the itching, however they do not seem to be getting any better. Should I see a Dr., how long will it take to heal?