hello,
welcome to healthcaremagic.
it seems to be vitiligo or xanthelasma.
is it found only on your eyelid or any other parts of your body?
vitiligo can be found in other parts. is there any itching?
xanthelasma is due to excess cholesterol.
better to consult your dermatologist and get evaluated.
take care

Hi!Jho Carrabba,
Welcome To Healthcaremagic forum,

I would like to know few things here:
1) what is your age.
2) what is your normal skin color.
3) do you have thyroid problem.

With the history you have provided it seems to be a post inflammatory
de-pigmentation or pre-vitiligo.
Both condition can occur after a mild trauma.
I would advise you to wait and watch for few weeks initially.
If the patch is spreading or is becoming more prominent ,then I would suggest you a treatment.This would mean that it is vitiligo.
If the patch remains as it is or regresses,then it is a post inflammatory de-pigmentation.
This is just for diagnostic purpose,since your treatment would remain same in both the case.
You would require a mild steroid cream or tacrolimus cream for local application.
If the patch is spreading fast then you would require oral steroid and other immunomodulator.
You can also go for phototherapy(PUVA & NBUVB) depending upon your age.

Hope this answers your query,if you have any further questions ,please write back to us.

regards,
Dr.chawda

Hi! again,
Thank you for your reply,

There are two possibilities here :
1) vitiligo : if the spot is flat and milky white.
2) xanthelasma : if the spot is white and raised above the skin level.

For vitiligo ,you should use topical mild steroid cream or tacrolimus cream,along with phototherapy .
For xanthelasma ,you need to go for a laser treatment or a surgery.

For both you should consult a dermatologist for proper treatment .

regards,
Dr.chawda