I am 25 year old and have developed very itchy nipples. Should i apply something on them?

In young people, itchy nipples are nothing to worry about. 

The itching may be due to tight clothes or your nipple rubbing against your bra or under shirt. This can happen if you exercise without a bra. However, chronic itching can also be a sign of eczema. 

If the itching is bothersome, obtain hydrocortisone cream over the counter and apply it 3-4 times day. If this problem persists after application of hydrocortisone, it is wise to see your doctor. Another common cause of itching around the nipples is a fungal infection, which can also be easily treated with an anti fungal cream. 

If the itch is limited only to your nipples, perhaps a change of fabric or bra may be warranted

Can you tell me why my nipples are erect all the time?

In most cases, nipple erection is associated with sexual arousal but in some women, nipples may remain erect without any sexual stimulation. why this happens is not well known. 

Sometimes, nipples can be erect when they are excessively irritated like when you start to pluck hairs or wear tight clothing. Some women love to show of their erect nipples but for those who are shy, then there are a variety of padded bras which can be worn. 

If you constantly plucking your hair around the nipples, stop the habit and see what happens. If it is the clothes that cause erection of your nipples, start to wear a bra, change the fabric or wear loose clothing. 

In any case, erect nipples are treated conservatively and there is ZERO need for surgery- unless you love pain.