How does your employer not have a bathroom for its employees to use (ALL employees)? That doesn't seem right at all...what do you do if you have to use the restroom? Very odd. Well...is there an office you could use or do you drive a car to work? Or a store next door or something with a restroom where you could go on your break? I definitely think you need to be cleaning it out more regularly that you are or it won't heal. At a minumum...I would change it first thing when you get up, at lunch break, when you get home from work, and before you go to bed. Those might not all be equally spaced exactly...but it will be close. Especially if you cannot leave it open for long stretches of time...the dressing needs to be removed and the wound cleaned multiple times a day.

Once the wound scabs over...you would likely still be able to tell if it was infected because it would either leak pus around the edges or you would get a boil or some visual sign of the pus building up under the skin. I think this would be bad...which is why it is all the more important that you clean the wound several times a day. Lancing it doesn't HAVE to be done by a doctor but that's what I would suggest (just safer and more sterile). It can be done with a needle, scalpel, or a razor blade. I shudder to even think of it.

Definitely do what you can to keep it cleaned out. If you ABSOLUTELY cannot change the dressing at work in any way then definitely before work, immediately after work, and before bed...soaking it in the evening if you can and leaving it open to the air as much as possible in the evening.

Alt's advice about removing the bandage is good advice...not having had too much experience with something like this recently (it's been a good long while since I had a nasty knee scrape) I would not have even thought about that. Anything that can save you additional pain is a good thing.

Take care.