White spots over the glans(glands) penis since the past 5 years

Hello, I have noticed so depigmentation in the glans (glands) penis 4 to 5 years ago, first i noticed a tiny white spot (2-3 mm) and now i have contiguous depigmentation in the border of the glans (glands) penis in the right side, maybe of  1 cm long. I have never visited a physician because it doesnt hurt or burn, is just the change in color that worry me. I have not noticed any change in those white spots since the past 2 years, no increase or decrease in size. I am 24 years old and still virgin, so no STDs in the past. I must say that  now I am concern if a girl ask me one day what are those spots...
I would like to add also that I have a history of being treated for pityriasis versicolor in my upper back, with selenium shampoo. I thought that maybe those spots were also pityriasis, but i am concern about vitiligo too...  in the past few days I have being putting some salenium shampoo over the glans (glands) penis to see if it causes any change. Also I would like to know if by exposing my penis the sun light this can restore the pigmentation.
Please let me know what you think I have.

[Dr_Aparna]

Hi,
Since this depigmentation is a long-standing issue it could be Vitiligo rather than a fungal infection.
Tinea versicolor is common in the summer months and fungal infections usually come and go, they do not remain static in a location. However in your case this still does remain a possibility since you do have a history of these lesions.

Tinea versicolor is caused by a fungus that lives in the skin of almost all adults. This fungus exists in two forms, one of which causes visible spots. Factors that can cause the fungus to become more visible include high humidity and immune or hormone abnormalities. However, almost all people with this very common condition are perfectly healthy.

When tinea versicolor produces lighter-colored spots, it may take up to several months for the color to even out between skin areas that are affected and not affected. It always eventually does, however. Tinea versicolor does not leave permanent skin discoloration.

A skin biopsy should clear the issue for you.Fungi typically demonstrate a characteristic appearance.
Vitiligo  or leukoderma is a chronic skin disease that causes loss of pigment, resulting in irregular pale patches of skin. It is associated with autoimmune and inflammatory diseases.

The traditional treatment given by most dermatologists is corticosteroid cream. Ther are other options available like phototherapy and  immunomodulator creams, but whether they can be used for the depigmentation of the glans (glands) is something you will have to discuss with your dermatologist.

ref:http://en.wikipedia.org/wiki/Vitiligo