hi. i guess subconsiously if not consciously you remembered how much you struggled before cutting in a place where it was noticable. its quite common that pepople cut in less noticable places.
self harm isnt just about the action.you may have stopped the cutting but it dosnt remove the feelings and emotons that triggered you to do it in the first place. like you said having not recieved any support maybe you still could do with some. its like a drinker who drinks to block out a painfull event once they stop drinking soon enougth the 'soberness' and clearer thinking will prob reserface those feelings.
maybe you have managed not to cut but did you turn to something else? that to is common we replace one coping mechnism for another. for us that self harm it is that we dont think much of ourselves, did your self harm calm down when you met your boyfriend? asking because he has probably shown you the care and attention that you found hard to give to yourself? i have found that sometimes the times we struggle isnt always in the mist of it but when things calm down, for example when i moved into my flat things were hard but everything was still new and stimulating, i had lots to focas on, my struggles came when i had eventually brought everything i wanted and had made it nice, maybe this has been a little bitlike this for you? maybe now you feel settled and secured and everything apperars to be going alright, that in fact now is probably when old feelings will resurface? i dunno if any of this makes sence to you? just a thought
as for getting help, i think you should, you need to treat the problem before it escalates again, life is one long consistant battle sadly we may fear we have left it behind but it never really goes away untill we address it, its like for example, imagine you were shot and the bullet became logged in your arm you could cover it up with a plaster to decrease the bleeding and it may heal enougth to leave the plaster off but at some point that bullet needs to be removed, most probably an infection will occur and at first trying to remove it could be very painfull but it is only when it is removed can it fianly heal
as for the hoilday i think with your family already knowing about the past difficultys if they do see your scars you may need to be prepared for their concern which will probably express, but maybe in a roundabout way they may help to get you help, family can do so much but when they are unknowledable about si it is cruical we gain professional support,
take care, keep posting hope this has helped and makes sence