Sometimes you learn about a disease just before you run into it for the first time. That has happened again and again in my career.
After I published my post about bot fly infections, a commenter asked if I had seen the larvae and suggested it might have been a case of Morgellons disease. I had never heard of that one, so I read up on it. Morgellons is a subtype of delusional parasitoses (DP), which can have many etiologies.
My own patient’s larvae were well documented by others and I think I saw them during our telemedicine visits.
A few days later I had reason to remember my impromptu research.
Gail is a woman in her forties with anxiety disorder and fibromyalgia. She came in with a concern about parasites under her skin and told me two of her girlfriends and her next door neighbor also had them.
Each one of them had seen several providers including the emergency room and basically had been told they might have scabies but probably didn’t. They had all tried and failed topical permethrin.
But Gail gave me a vivid description of all the teeny-tiny parasites she saw in the bottom of the tub after she bathed off the permethrin the morning after her treatment.
She also described, in excited and dramatic language, how scraping the skin where she saw a little black “thing” would make her suddenly itch or bleed some distance away. She used descriptions like “they get angry” and “they are clever”.
I looked and I looked. I took off my -10 diopter glasses and placed my eyeballs 4 inches from her skin, spotted with blemishes of different age and size. I saw nothing that looked like insects, burrows or bites.
I offered to do some skin scrapings. Gail was pleased. As I did it, I did see her unusually thin skin start bleeding very slightly half an inch away from my sampling here and there and she said, “see, they’re on the move”.
I submitted my sample and as I wait for the path report I am thinking about what to say next.
Here is what I have learned from UpToDate:
Delusional parasitosis can be associated with a host of psychiatric conditions but can also have its root cause in tingling sensations caused by medications, from ciprofloxacin to topiramate, amantadine, ketoconazole and many others. It can be related to diseases that cause paresthesias, from Lyme disease to restless leg syndrome (Ekbom’s disease, which can be linked to iron deficiency) to diabetes and many others.
Regarding Morgellons, which my commenter suggested, UpToDate writes:
Morgellons is a syndrome characterized by symptoms that appear to be identical to delusional infestation or very similar, but with the addition of the affected patient’s beliefs that inanimate objects (such as colored strings or fibers) were present in the lesion as well.
UpToDate and many other sites, including Wikipedia, point out that one (possibly increasing) common cause of delusional parasitosis, or formication, is methadone or cocaine abuse:
Some users also report formication: a feeling of a crawling sensation on the skin also known as “coke bugs“. These symptoms can last for weeks or, in some cases, months.
So now my question is: How do I tactfully explore if the cluster of cases in my community has anything to do with meth or coke when so many other things theoretically could cause these symptoms?