Why is ipod microphone not working?

First of all I would like you to check that whether you mic is working properly other than skype or not if it is working with other and not working with skype then i think problem is not with your headphone as it is working normally. In this case I would like you to re install your software again and use because it may be your software which is creating problem and else if you are having actual problem with headphone then I would like to tell you that you can get your headphone repaired at nearest customer support center. For this you need to check out that whether the brand which you are using has its customer support center or not.

You can directly place you complain at customer support and they can give maximum support to their extent and make sure that if your product is in warranty then they won't charge you any repairing cost as per there warranty condition. And there may be chances that your head phone don't bear your warranty conditions then you can get it repaired at the nearest repairing shop other than trying yourself which can surely create more problem than solving it.

To find your customer support center you can take help of user's manual and can get loads of other help even.