What does a spotty red rash on my arm mean? The rash has small red spots and is bumpy.

Many things

Keratosis
A common condition is keratosis pilaris (KP). Small reddish bumps appear on the back of the arms and sometimes the front of the thighs. It is very common and not dangerous. If you are unsure, please see a dermatologist.
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Keratosis Keratosis pilaris Rash Red spots Arm Dermatitis Red skin Skin rash

answered:

RASH

Skin_rash
while a picture is worth a 1000 words, a rash needs to be seen. words spoken or written will not do.
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Rash Red spots Arm Dermatitis Red skin Skin rash