(What would cause you to believe this? Are you or have you been in an area where this is present?)
I took a bath with the family dog that had an itching problem when I was 7 years old. This is my best guess of how I got it.
I've swum in several lakes throughout my life. And, I was bitten by a Kissing Bug 11 years ago.
Also, I feel crawling, stinging, and biting beneath my skin and in my muscles constantly that also causes severe pain. And, I've had lesions that look like those I saw on a leishmaniasis web site that I cannot find now.
(To get a proper diagnosis, see a parasitologist. If it is the cutaneous type, there is a simple but slightly painful treatment.)
Where would I find a parasitologist that treats or even sees humans?