Ingrown hairs after needle epilation - back of the thighs

Im 38 years old, not sure why im growing hair in this places.

After my first session of needle epilation on the back of my thighs and inner thighs, I have ingrown hairs. I never had ingrown hairs before because I never removed the hairs with the root but only trimmed to 1mm. About 3 months ago I had the treatment, as I see it all the hairs have grown back. So the first treatment can be compared to a zero success. Are ingrown hairs a sign of “bad” needle epilation? To me, it looks like new hair is already growing out of the red treated spots and even more hair is visibly growing.

Can anyone give some advice?

Find another electrologist.