Please help with this

Hi
Can someone please tell me what this is, I know its a really common plant and spreads like mad in my garden but I quite like the flowers so I've left it but am constantly pulling it out around the place. Some of the leaves sometimes have white spots as per the second attachment, someone told me it was comfry but I don't think it is, any help is appreciated. Thanks

 

Hello,

The above plant grew like mad in my garden. For some reason my skin reacted badly to it. And yes , it went absolutely beserk

 

Thanks for your help with this. I think I'm going to leave it in the garden, luckily I don't get a reaction to it. I'm glad I know what it is now x