Unlikely: Most common lesion on the back as you described is a pimple or sebaceous cyst. Both of which are localized skin infections/inflammations. A spider bite could occur on back but is less likely. A spider bite could get infected or it could cause tissue necrosis as with the brown recluse spider bites. Best to have a doc look at it.
Answered 6/2/2016
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3 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
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