Welcome to HCM
We understand your concerns
The itchiness and tiny bumps might be allergy
. It could have happened due to any of the causes you mentioned above, most preferebly the lube you used. Have you consulted any physician before using the lube? Because most of the lubes are to be used having allergic conditions in mind.
This also can happen due to unhygeinic being, underwears etc.
Anyhow, for the time being it would be better for you to consult a dermatologist
for expert advice.
Get well soon.