Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain
pimples in between the butt cheeks that is painful on sitting or doing any activity can be due to causes like :
1.Infection of the hair follicle..
2.Infection in the gland.
3.Infection over the skin leading to bacterial accumulation and pus formation under the skin..
I would suggest you to wash the area with warm water and soap..
You should make the area dry and apply antibiotic ointment over it.
You can do warm compresses over the bump as it will help in draining the boil easily and healing it soon..
You should keep the area dry and clean as if there is moisture accumulation it can lead to increase in infection..
Avoid scratching it as it can increase the infection and the infection can penetrate deeper..
But in case if it does not resolve and gets bigger
consult a Proctologist and get evaluated and he can do an
Incision and Drainage as it will help in faster healing..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.