Contact dermatitis or bed bugs help please!?

I recently dyed my hair at home, I don't know if I have an allergy reaction to the chemicals cause it kinda got on my skin. Recently I've been waking up with red itchy bumps. First it appear on my hands- took a few days to go away, the redness is still here. then the other day on my back 3 bumps, last night... show more I recently dyed my hair at home, I don't know if I have an allergy reaction to the chemicals cause it kinda got on my skin. Recently I've been waking up with red itchy bumps. First it appear on my hands- took a few days to go away, the redness is still here. then the other day on my back 3 bumps, last night 4 of them appear on my arms. could this be bed bugs or an allergy reaction? My sister and I sleep on the same bed, and she has no bite marks. and also my other family members.. help please
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