Answer:
I have used Compund W ( for warts) at home on the spots that are raised. There needs to be several applications . It works like the freezing at the dermatologists office but it takes a little longer.
Plan B:
....You don't even need compound W unless it's bigger than an eraser...
Here's a great answer from a family practitioner:
'I Use Fingernail Surgery to Remove My Seborrheic Keratoses'
George D. Lundberg, MD - www.medscape.com:
http://www.medscape.com/viewarticle/548889
...I was a little skeptical, but couldn't believe how easily these things scrape right off. (...and if it doesn't scrape right off, it's probably not seborrheic keratosis - in which case you may want to have a doctor check it out for you.)