Sorry Honey is not very well

Is he a syrian? Is the 'little brown spot' to the side of his back? If so these are scent glands called hip spots.... these are normal and nothing to worry about.... just saying that when they lose fur these do become more noticable, hence you might not of seen them/it before.

As for the lump..... it could be an abcess.....
Abscesses occur when a bite, scratch or wound becomes infected and pus forms under the skin resulting in a lump. Often the bite or scratch may go unnoticed. Indeed by the time the lump is noticed the bite or scratch which originally became infected may have healed so it is often difficult to establish whether the lump is an abscess or a tumour.

If a bite or scratch can be seen on the lump then it is almost certainly an abscess. An abscess will require the pus to be drained and a course of antibiotics may be needed to treat the infection and so veterinary treatment must be sought. In extreme cases it may be necessary to visit the vet regularly as the pus may need to removed more than once whilst the infection clears.
Or a tumor/cancer
Internal tumours such as those involving internal organs may be difficult to treat but many external tumours can be successfully surgically removed.

A hamster suffering from cancer may develop a hard lump which can increase in size quite quickly. It is often difficult to distinguish between a tumour and an abscess. A tumour may be accompanied by fur loss, lethargy, poor condition or wasting but not always.
Info about old age
As a hamster passes the age of one year signs of old age may appear such as fur loss, some weight loss, drying of skin and a general slowing down, although many hamsters do not show signs of old age until much later.
Big patches of fur could be mites... My Kenco has them at the moment.... of course fur loss could be due to old age, but if it's a large amount in not much time, I would watch out for the skin looking sore etc just in case it is mites.

Anyway, I hope that may help in someway (all info comes from http://www.hamsters.co.uk/hamster_health.htm )