Spotting everyday??

Abbey
I've been off the pill since august after being on it for six years. I'm 23. I went straight back to regular periods of 28/29 days. The last few weeks I've had spotting everyday. Like dark brown thick blood. Period as normal too. But my skin has also gone really spotty, on my face, back and shoulders. I never had spots when I was on the pill. 
Any idea what's the problem. I don't know if it's worth going to the doctor?