So I have been battling The Depluming Mite recently. I have silkies so these are hard to detect on them unless you do a daily head check. In the summer I bought a Rooster and added him to the coop. After a couple months he got this Nasty looking crusty stuff on his head & skin around his eyes, I had never seen anything like this Basically just on his head!!! but affects all the skin around the eyes too! ( Lady I bought him from is reputable and told me she rescued him living in Deplorable condition's but had been treating him for Mites/lice ect. and she thought she had FINALLY prevailed against it. He looked really good when I bought him.. no signs of any pests.... Long story short...I believe he brought this De-pluming mite to my coop UUUUGH! I did rehome him and let them know what I had been dealing with! Since then... this Mite will crop up on just one or two but is a pain it my Patushky!!! lol The BEST most effective treatment that I have found is Bringing the Chicken in the house and bathing it with a Product I bought from the Vet it is a shampoo from VET solution's and it is a Medicated Shampoo for dogs,cats,horses. ACTIVE INGREDIENTS : Miconazole Nitrate 2% Chloroxylenol 1% The Name of it is SEBOZOLE I put about a Nickle size amount in the water and stir the water well and then put the chicken in there and bathe them Head and all and let them soak about 15 minutes then... just rinse Quickly leaving most of the solution on them ( I just barely run clear warm water over them & then I place them in a towel and blow dry them. This stuff works WONDERS and the chickens hair will start growing back fast! De-scales and KILLS those mites and STOPS the itch & SOOTHES the skin! My dog had ringworm from a wild rabbit so she had prescribed this with the bathing instructions so when I seen this Mite ( because it buries under the skin and hatches Live young ) My Common Sense kicked it and I tried it & IT WORKED!!!! Now this is what I bathe all my chickens in If troubles crop up!!! I wanted to share it is AMAZING the relief they get from this!!!!