What's that reddish rash slowly overtaking the awkward area below your armpit? If you haven't recently rubbed up against a poisonous shrub or eaten something you're allergic to, it's most likely a heat rash. The name implies it's caused by direct exposure to sunlight, but it's usually caused by fabrics that trap heat and suffocate and chafe your skin in the process. This trapped heat clogs your sweat ducts, which causes them to swell and itch.

Stick to breathable, cotton clothing when possible, stay away from any skin care products are full of oil, and try to keep any areas affected by heat rash dry. Get out of the heat, remove the clothing that's causing the problem and apply a cold compress. Then, apply like Skinfix Rash Repair Balm, $16.50, a natural balm (and summer beauty bummer cure-all) that heals a number of skin irritations sans steriods. Image Source: Pinterest