I will take at face value that you're experiencing recurrent/intermittent blood blisters on your cheek. Having said that, your photograph does not portray the typical appearance of a blood blister ("hematoma"), but rather a small venous formation usually referred to as a "venous lake". The bluish lesion under the tongue is also either a venous lake or a varicose vein. These structures are common in persons over the age of about 30 years, and are normal anatomic features. They have no health implications, and may be safely ignored.
If you are experiencing a true recurrent blood blister in exactly the same spot, this would imply that some type of repetitive physical injury is responsible. Such an injury may arise from a sharp tooth edge or a functional abnormality in the position or shape of your teeth. Your dentist may be able to assess the shape and position of your teeth to identify the offending upper/lower tooth contact and take some sort of remedial action, such as a selective re-contouring of the suspicious tooth contours. (Occasionally, some people develop blood blisters repeatedly in different locations in the mouth; this condition is known as Angina bullosa haemorrhagica, but this diagnosis would NOT apply in your case due to the consistency of location of your lesion.)
The whitish area immediately behind your lower wisdom tooth is referred to as "attached gingiva"; it is covered by a superficial layer of keratin, which is the mechanism by which gum tissue protects itself against mechanical friction. Areas of attached gingiva that sustain friction tend to thicken (i.e., become "hyperkeratotic"), which is an adaptive response analogous to the formation on the hands of someone who does heavy manual labor. Attached gingiva is likewise a normal anatomic feature; because it is also normal, it can be safely ignored. Likewise, the linea alba of the cheek is a result of keratosis of the cheek from the mechanical friction that accompanies the chewing process. The linea alba is, not surprisingly, always at the vertical level where the upper and lower teeth meet, which further underscores its functional origins. It is, as were the previous phenomena, a normal anatomic feature which may be safely ignored.
The "red veiny look on (your) soft palate" is a result of the thin, translucent nature of the tissues that cover this part of the mouth, that allows the rich network of tiny blood vessels to shine through and become clearly visible. (These tissues are NOT keratinized). The supply of blood vessels to these tissues is quite dense. If there is any abnormality in your photos at all (and this is over-reaching on my part), it may be that your soft palate may be a bit redder than average, although there is no way to exclude the possibility that this is just the normal appearance of your soft palate. These tissues may become a bit redder than accustomed in the presence of an upper respiratory viral infection or allergy, so if you have symptoms resembling a cold or allergy, this may merit a formal evaluation by your primary care medical doctor. However, there is nothing in any of your photographs that otherwise suggest any abnormality, much less malignancy. Were I to have examined you in person and found the visual characteristics displayed in your photographs, and I did not detect any other abnormalities during manual palpation and review of your medical history, my conclusion would be that of a normal adult without any conspicuous disease.
Hope this helps...