Hi welcome to the health care magic You have not mentioned duration of your cough and chest cold... Here if cough is since three week than better to investigate with chest x ray also Work up done as follow ... -Auscultation -CBC -Spirometry only if needed If CBC shows high eosinophila than fexofenedine given for 10 day course If neutrophilia present than antibiotic prescribed Meanwhile if cough wet and doesn t expelled out Ambroxol or bromhexin containing syrup can be prescribed for that Take phenylephrine like decongestant for relief Vitamin C lozenges chewed four times a day Take care Bruise might be from injury or excess coughing.. If pain develop and increase in size than USG done for that Consult pulmonologoist for examination and further work up Hope my answer will help you