Respected user , hi I evaluated your query thoroughly.
*In your case, it seems related to Hyperthermic effect on forehead veins.
not to worry at this juncture.
@ Avoid excess heat / direct sun exposure.
@ Maintain your hydration by plenty of liquids orally .
@ Maintain your BP , Blood sugar levels
@ Apply protective measures like cap / helmet when working in sun.
@ Avoid
smoking / alcohol.
@ Can take analgesics like Acetaminophen(325)mg mor & eve after meals
for 2-3 days.
@ Consult later your family Dr. if needed at all.
Thanks for using Health Care Magic & keeping trust in our medical services.
Wishing you fast and speedy recovery from the same.
Regards.
Bye dear take care.