Under skin red spots on end of big toe. Also have toenail fungus on same toe.

Red dots. near toes could be an extension of fungus onto the skin from your toenail. Get some help and see a podiatrist or skin doctor for more clarification and treatment.

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High fever for two days, red spots developed on my skin mostly foot and palms, itchy but when scratch or touch, it hurt as if it is swollen.

Hand & foot rash. Many skin conditions can involve hands & feet. Some of them are erythema multiforme, that looks like little targets, usually triggered by a cold sore eruption but could be due to medications, a viral infection called hand, foot & mouth disease that has oval blisters surrounded by rim of red on palms, soles and in mouth. These may have fever, also eczema, psoriasis, etc. Please see dermatologist. Read more...

I have small red spots on my skin. Legs/stomach/neck/foot. But aren't all there at once, once one set of them disappear another comes up. What is it?

Hives. Sounds like hives. If they itch, look like a mosquito-bite, and come & go, then it is likely hives. Try an otc antihistamine. Read more...
See below. These symptoms can only be adequately diagnosed only after a thorough evaluation by your doctor. This may include labs and other satudies. Once all of the information is in, your doctor can let you know what's going on, and what to do to help you. Read more...