Im stumped! What is growing on my bud?

[3 Sheets To The Wind]

ive been smoking for 6 years and ive never seen this b4. id post pictures but my pc is gay and wont let me. i seperated the good buds from the buds that this is happening to. the stuff on the bud is bright yellow and doesn't look like mold.

Scrape it all off and smoke a bowl of it... see what happens!