It is a good idea to try not to touch the Glass on Halogen Light Bulbs, even when changing the bulb. This is because when you touch a Halogen Light Bulb, you leave behind a residue on the Light Bulb which can in time cause the bulb to heat up unevenly, and even cause the bulb to shatter as a result.
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Another reason to try to reduce the handling of Halogen Bulbs is that they heat up to extreme temperatures, and could burn you if touched whilst still hot.
When handling a Halogen Light Bulb it is recommended to wait for the bulb to cool down before doing so, for half an hour or so. When handling and changing Halogen Light Bulbs it is recommended to wear gloves, and handle them as little as possible.