Alan Evans, 50, from Yatton near Bristol, returned to Britain to find the little stings he got during a fortnight in the Gambia with his wife Karen had grown into throbbing boils.
The father-of-two had been infected by bot fly, which lays eggs beneath the skin and feeds on human cells.
Antibiotics did not help the condition and when Mr Evans inspected his invaders through a magnifying glass he saw they were wriggling.
A consultant diagnosed him with the rare disease Myiasis, contracted by an infestation of parasitic larvae.
Four of his unwelcome guests were cut out surgically, and he squeezed the rest out himself.
“At one point it looked like a crab’s claw, and I was petrified I had baby crabs growing inside me. It was terrifying,” the delivery driver told the Western Daily Press.
“I was told there was a million-to-one chance of getting this.”
Dr Ron Behrens, of the London Hospital of Tropical Diseases, added: “This is more common than you might think in people returning from Africa and South America.
“It can occur in anyone. A mosquito drops the bot fly’s eggs on to the skin.
“The pupae then burrow under the skin - often the scalp, legs or groin area - and feed off it, but stay close to the surface so they can breathe.
“After a couple of weeks they develop into flies, and are moving around, which is very unpleasant. But luckily it can be successfully treated.”
OMG!!! 
Excuse me whilst I undergo a MAJOR HEEBEE JEEBEE ATTACK!!! 
*...shudder,shudder,shudder,shudder…*
Ewwwwwwwwwwwwwwwwwwwwwwww!
(Thank you SO MUCH Star Trek III: Wrath of Khan!) 
