As Dean indicated, making an online diagnosis from a written descriptive can be impossible.
While a dermal paasite could be the culprit, your description is also indicative of a Staphylococcus spp. infection, not to scare anyone, but this can be serious, as there has been a great increase in such infections among reptiles and many have proven to be very resistant to traditional antibiotics, not to mention, highly contagious.
I received a P. d deppei, from a reputable dealer, with such an infection. After several months of unsuccessfully trying to treat the infection, I decided to cull the specimen.
Your snake may very well have a dermal parasite, but for your own peace of mind and the health of your snake, you really should have the snake examined by a qualified veterinarian for an accurate diagnosis...

Best regards,

Jeff Snodgres
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Jeff Snodgres
University of Arkansas
snodgresjeffreys@uams.edu
501.603.1947

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