Iron supplements and itchy skin

Allergies, blood and immune system
1

ive been taking iron supplements 150 mg a day for two months and over the past couple weeks I’ve developed an itchy scalp and an itch on my Lower back.

could I have developed an allergic reaction to the supplements?

My ferritins were 7 the end of July and had increased to 33 the middle of September.

2

Anything’s possible! 

Why are u taking such high mg?

Here in US iron supplements average 65mgs, & even lower. I couldn’t take 65mgs anymore cuz it caused internal bleeding. So my pharmacist recommended slow release iron at 45mgs.