My skin develops hard white bumps after sun exposure that are not sweat bubbles. am i allergic to the sun? also don't tan well

Sun Reaction: Sometimes, when the skin is exposed to the sun, one gets a sun allergy (photosensitivity), which is a reaction of the immune system to the sunlight. Given below are the most common types of sun allergies: solar urticaria, photo allergic eruption, polymorphous light eruption, and actinic prurigo.

Depends: I recommend a broad-spectrum sunscreen offering protection against both uva and uvb rays. Usually, at least three active ingredients are called for. These generally include paba derivatives, salicylates, and/or cinnamates for uvb absorption; benzophenones for shorter-wavelength uva protection; and avobenzone, ecamsule, and titanium dioxide, or zinc oxide for the remaining uva spectrum.

Diff possibilities: These could be a type of milia or breakout that can be triggered by allergic reaction or irritation. If sun exposure is a trigger, then try protecting yourself from the sun or avoiding direct sun exposure. Some sunscreens can cause plugging of the pores and exacerbate the condition. Try different brands, zinc oxide provides best protection. Wear hat, stay in shade. Avoid peak hours 10 am to 4 pm.