two days of copper sulphate

the little hole at the top left is the original fly bite

the sarcoid developed below the fly bite and appeared 

as a shadow of a circle in the hair and was increasing in size,

which is what made me decide to act.

 

two weeks later, healing nicely with good healthy skin margin

and reducing in size every day.

(orientation of the photo is different, the deviation at the top 

of the circle is the original fly bite.)